The proper spelling for the word is "mustache," not "most bearding." The IPA phonetic transcription for "mustache" is /ˈmʌstæʃ/. This word is derived from the old French word "moustache" and was adopted into English in the early 16th century. The spelling of "mustache" is relatively straightforward, with the "m" and "s" sounds being pronounced as written. The "t" and "ch" sounds are pronounced together as a single consonant cluster "tʃ."